#include <stdio.h>
#include <unistd.h>
#include <string.h>

int main(int argc, char *argv)
{
  if(argc != 2){
    printf("Usage:%s -[a,b,c,d]\n", argv[0]);
    return 1;
  }
  strcmp(argv[1], "-a") == 0){

  }
}
